Question
Answer
$$-10i^2+10i+20=10i+30$$
Explanation
Tap the blue circles to see an explanation.
| $$ \begin{aligned}-10i^2+10i+20& \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle1}{\textcircled {1}} } }}}10+10i+20 \xlongequal{ } \\[1 em] & \xlongequal{ \color{blue}{ \text{\normalsize{ \htmlClass{explanationCircle explanationCircle2}{\textcircled {2}} } }}}10i+30\end{aligned} $$ | |
| ① | $$ -10i^2 = -10 \cdot (-1) = 10 $$ |
| ② | Combine like terms: $$ 10i+ \color{blue}{10} + \color{blue}{20} = 10i+ \color{blue}{30} $$ |
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